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BikeLoc: a Real-time High-Precision Bicycle Localization System Using Synthetic Aperture Radar

BikeLoc is a portable and low-power bicycle localization system that uses a combination of wheel sensors and WiFi signals to achieve high-precision real-time localization. It overcomes the limitations of GPS in tall buildings and tunnels. This system has been designed and implemented with promising localization accuracy at a level of tens of centimeters.

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BikeLoc: a Real-time High-Precision Bicycle Localization System Using Synthetic Aperture Radar

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  1. BikeLoc: a Real-time High-Precision Bicycle Localization System Using Synthetic Aperture Radar Hongjiang Lyu, Linghe Kong, Chengzhang Li Yunxin Liu, Jiansong Zhang, Guihai Chen 2017.8.3 APNet 2017

  2. Development of Smart Bicycles

  3. Why not GPS? • GPS's error is at meters level. • It performs poorly under tall buildings and in the tunnel.

  4. Requirements for Bicycle Localization System 1 • Portablility 2 3 • Little power consumption • Online algorithm

  5. A new bicycle localization system Related works: S. Kumar, S. Gil, D. Katabi, and D. Rus. Accurate indoor localization with zero start-up cost. MobiCom, 2014. J. Xiong and K. Jamieson. Arraytrack: A fine-grained indoor location system. NSDI, 2013. S. Nirjon, J. Liu, G. DeJean, B. Priyantha, Y. Jin, and T. Hart. Coin-gps: indoor localization from direct gps receiving. MobiSys, 2014. BikeLoc:

  6. Overview of BikeLoc 1 2 3 • Take Channel State Information (CSI) snapshots • Determine the • direction of APs

  7. Theoretical Part Circular Synthetic Aperture Radar Wireless Channels Relative Power Relative Power

  8. Theoretical Part Circular Synthetic Aperture Radar Obstacle Wireless Channels Relative Power Relative Power

  9. Theoretical Part Extending to Three Dimensions Relative Power

  10. Design of BikeLoc z • Position of • the APs x y • Height of • the wheel • Position of • the wheel Starting point Middle point Current point

  11. Design of BikeLoc

  12. Why Wheel? • We use Circular Synthetic Aperture Radar (CSAR). • CSAR is tansition-resilient.

  13. Hardware Prototype of BikeLoc Laptop Mobike Antennas Gyroscope

  14. Experimental Results Relative power among different azimuthal and polar angle with antenna pairs: A1A2, A1A3, A2A3 and Sum of them. A2 A1 A3 Accuracy: 1.5° A1A2 Sum A2A3 A1A3

  15. Angle-Of-Arrival Estimation Accuracy AOA Estimation of Different Antenna Pairs:

  16. Localization Accuracy Localization Accuracy Against Number of APs:

  17. Localization Accuracy Error in Distance of Motion Sensor Localization：

  18. Conclusion • We design BikeLoc, a novel design to enable accurate bicycle localizationbased on a subtle combination of the wheel and WiFi devices. • We implement a prototype of BikeLoc. In our testbed, we showed that BikeLoc is very promising to achieve tens of centimeters level localization accuracy.

  19. Q&A

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